mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 13:46:47 +07:00
49fb88af23
Fix gpio-config off-by-one bug. Without this patch, touching GPA0 pin on S3C64XX platform causes kernel oops. Reviewed-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
167 lines
3.2 KiB
C
167 lines
3.2 KiB
C
/* linux/arch/arm/plat-s3c/gpio-config.c
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*
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* Copyright 2008 Openmoko, Inc.
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* Copyright 2008 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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* http://armlinux.simtec.co.uk/
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*
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* S3C series GPIO configuration core
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/gpio.h>
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#include <linux/io.h>
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#include <mach/gpio-core.h>
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#include <plat/gpio-cfg.h>
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#include <plat/gpio-cfg-helpers.h>
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int s3c_gpio_cfgpin(unsigned int pin, unsigned int config)
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{
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struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
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unsigned long flags;
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int offset;
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int ret;
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if (!chip)
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return -EINVAL;
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offset = pin - chip->chip.base;
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local_irq_save(flags);
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ret = s3c_gpio_do_setcfg(chip, offset, config);
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local_irq_restore(flags);
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return ret;
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}
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EXPORT_SYMBOL(s3c_gpio_cfgpin);
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int s3c_gpio_setpull(unsigned int pin, s3c_gpio_pull_t pull)
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{
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struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
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unsigned long flags;
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int offset, ret;
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if (!chip)
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return -EINVAL;
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offset = pin - chip->chip.base;
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local_irq_save(flags);
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ret = s3c_gpio_do_setpull(chip, offset, pull);
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local_irq_restore(flags);
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return ret;
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}
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EXPORT_SYMBOL(s3c_gpio_setpull);
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#ifdef CONFIG_S3C_GPIO_CFG_S3C24XX
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int s3c_gpio_setcfg_s3c24xx_banka(struct s3c_gpio_chip *chip,
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unsigned int off, unsigned int cfg)
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{
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void __iomem *reg = chip->base;
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unsigned int shift = off;
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u32 con;
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if (s3c_gpio_is_cfg_special(cfg)) {
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cfg &= 0xf;
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/* Map output to 0, and SFN2 to 1 */
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cfg -= 1;
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if (cfg > 1)
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return -EINVAL;
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cfg <<= shift;
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}
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con = __raw_readl(reg);
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con &= ~(0x1 << shift);
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con |= cfg;
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__raw_writel(con, reg);
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return 0;
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}
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int s3c_gpio_setcfg_s3c24xx(struct s3c_gpio_chip *chip,
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unsigned int off, unsigned int cfg)
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{
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void __iomem *reg = chip->base;
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unsigned int shift = off * 2;
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u32 con;
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if (s3c_gpio_is_cfg_special(cfg)) {
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cfg &= 0xf;
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if (cfg > 3)
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return -EINVAL;
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cfg <<= shift;
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}
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con = __raw_readl(reg);
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con &= ~(0x3 << shift);
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con |= cfg;
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__raw_writel(con, reg);
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return 0;
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}
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#endif
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#ifdef CONFIG_S3C_GPIO_CFG_S3C64XX
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int s3c_gpio_setcfg_s3c64xx_4bit(struct s3c_gpio_chip *chip,
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unsigned int off, unsigned int cfg)
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{
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void __iomem *reg = chip->base;
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unsigned int shift = (off & 7) * 4;
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u32 con;
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if (off < 8 && chip->chip.ngpio > 8)
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reg -= 4;
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if (s3c_gpio_is_cfg_special(cfg)) {
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cfg &= 0xf;
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cfg <<= shift;
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}
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con = __raw_readl(reg);
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con &= ~(0xf << shift);
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con |= cfg;
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__raw_writel(con, reg);
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return 0;
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}
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#endif /* CONFIG_S3C_GPIO_CFG_S3C64XX */
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#ifdef CONFIG_S3C_GPIO_PULL_UPDOWN
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int s3c_gpio_setpull_updown(struct s3c_gpio_chip *chip,
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unsigned int off, s3c_gpio_pull_t pull)
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{
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void __iomem *reg = chip->base + 0x08;
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int shift = off * 2;
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u32 pup;
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pup = __raw_readl(reg);
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pup &= ~(3 << shift);
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pup |= pull << shift;
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__raw_writel(pup, reg);
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return 0;
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}
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s3c_gpio_pull_t s3c_gpio_getpull_updown(struct s3c_gpio_chip *chip,
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unsigned int off)
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{
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void __iomem *reg = chip->base + 0x08;
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int shift = off * 2;
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u32 pup = __raw_readl(reg);
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pup >>= shift;
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pup &= 0x3;
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return (__force s3c_gpio_pull_t)pup;
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}
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#endif
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